Implement JDWP InvokeMethod and breakpoints on exception throwing.

Change-Id: I1142bee843104f0850fd7270752104d5d73a44f0
diff --git a/src/indirect_reference_table.cc b/src/indirect_reference_table.cc
index 5f5541e..7bb4dc2 100644
--- a/src/indirect_reference_table.cc
+++ b/src/indirect_reference_table.cc
@@ -86,7 +86,7 @@
 
   DCHECK(obj != NULL);
   // TODO: stronger sanity check on the object (such as in heap)
-  DCHECK_ALIGNED(reinterpret_cast<intptr_t>(obj), 8);
+  DCHECK_ALIGNED(reinterpret_cast<uintptr_t>(obj), 8);
   DCHECK(table_ != NULL);
   DCHECK_LE(alloc_entries_, max_entries_);
   DCHECK_GE(segment_state_.parts.numHoles, prevState.parts.numHoles);